<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    body {
      background-color: black;
      display: flex;
      justify-content: center;
      align-items: center;
      height: 100vh;
    }
    div {
      height: 100px;
      width: 150px;
      position: relative;
      border-radius: 10px;
      display: flex;
      justify-content: center;
      align-items: center;
      background-image: linear-gradient(45deg, gold, deeppink);
      animation: hue 3s infinite linear;
    }
    div::before,
    div::after {
      content: "";
      position: absolute;
      top: -15px;
      bottom: -15px;
      left: -15px;
      right: -15px;
      border: 5px solid #24acf2;
      border-image: linear-gradient(45deg, gold, deeppink) 1;
      clip-path: inset(0px round 10px);
      animation: clippath 3s infinite linear;
    }
    div::after {
      animation: clippath 3s infinite -1.5s linear;
    }
    span {
      color: white;
      font-size: 20px;
    }
    @keyframes hue {
      0% {
        filter: hue-rotate(0deg);
      }
      100% {
        filter: hue-rotate(360deg);
      }
    }
    @keyframes clippath {
      0% {
        clip-path: inset(0 0 95% 0);
        filter: hue-rotate(0deg);
      }
      25% {
        clip-path: inset(0 95% 0 0);
      }
      50% {
        clip-path: inset(95% 0 0 0);
      }
      75% {
        clip-path: inset(0 0 0 95%);
      }
      100% {
        clip-path: inset(0 0 95% 0);
        filter: hue-rotate(360deg);
      }
    }
  </style>
</head>
<body>
  <div>
    <span>hello world</span>
  </div>
</body>
</html>